#ifndef OMG_TDDS_SUB_QUERY_CONDITION_HPP_
#define OMG_TDDS_SUB_QUERY_CONDITION_HPP_

/* Copyright (c) 2009-2010, Real-Time Innovations, Inc.
 * Copyright (c) 2010, Object Management Group, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - Neither the names of the above copyright holders nor the names of their
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL A COPYRIGHT HOLDER OR CONTRIBUTOR BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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 */


namespace tdds { namespace sub {

#ifdef OMG_DDS_CONTENT_SUBSCRIPTION_SUPPORT
    
/**
 * ReadCondition objects are conditions specifically dedicated
 * to read operations and attached to one DataReader.
 * <br>
 * ReadCondition objects allow an application to specify the data samples
 * it is interested in (by specifying the desired sample states, view states,
 * and instance states). See the parameter definitions for DataReader's
 * read/take operations.) This allows the middleware to enable the condition
 * only when suitable information is available. They are to be used in
 * conjunction with a WaitSet as normal conditions. More than one
 * ReadCondition may be attached to the same DataReader.
 */
template <typename DELEGATE>
class QueryConditionBase : public virtual ReadConditionBase<DELEGATE> {
    OMG_DDS_REFERENCE_TYPE(QueryConditionBase)

public:
    const std::string query_expression() const;

    dds::core::StringSeq&
    query_parameters(dds::core::StringSeq& dst) const;

    const dds::core::StringSeq query_parameters() const;

    void query_parameters(const dds::core::StringSeq& query_parameters);
};

#endif  // OMG_DDS_CONTENT_SUBSCRIPTION_SUPPORT

} }

#endif /* OMG_TDDS_SUB_QUERY_CONDITION_HPP_ */
